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—The continuous growth of wireless networks calls for more and more sophisticated solutions for their security. In particular, mechanisms for limiting effects of routing protocol attacks are becoming a mandatory requirement: black-hole and gray-hole attacks can in fact seriously compromise the performance of a critical infrastructure like a Wireless Mesh(More)
In this paper, we face the challenging issue of defining and implementing an effective law for load balancing in Content Delivery Networks (CDNs). We base our proposal on a formal study of a CDN system, carried out through the exploitation of a fluid flow model characterization of the network of servers. Starting from such characterization, we derive and(More)
A number of distributed applications require communication services with Quality of Service (QoS) guarantees. To the purpose, resource management is required both in the end-system and inside the network. To date several approaches have been proposed, dealing either with end-system issues or with those more strictly related to the network, but no unified(More)
In this article we present a thorough performance analysis of an actual implementation of a distributed conferencing framework compliant with the IP multimedia core network subsystem specification. The subject of our experimental campaign has been an architecture implemented by exploiting existing achievements in the field of conferencing. The work(More)
In this paper we present the results of a study we recently conducted by analyzing a large data set of VoIP Call Detail Records (CDRs), provided by an Italian telecom operator. The objectives of this study were twofold: (i) first, to provide a representation of users behavior , as well as of their mutual interaction and communication patterns, allowing to(More)
This paper deals with the design and implementation of Janus, a general purpose, open source WebRTC gateway. Details will be provided on the architectural choices we took for Janus, as well as on the APIs we made available to extend and make use of it. Examples of how the gateway can be used for complex WebRTC applications are presented, together with some(More)
Web Real-Time Communication (WebRTC) is an upcoming standard that aims to enable real-time communication among Web browsers in a peer-to-peer fashion. The IETF RTCWeb and W3C WebRTC working groups are jointly defining both the APIs and the underlying communication protocols for setting up and managing a reliable communication channel between any pair of(More)
Pattern recognition is the discipline studying the design and operation of systems capable to recognize patterns with specific properties in data sources. Intrusion detection, on the other hand, is in charge of identifying anomalous activities by analyzing a data source, be it the logs of an operating system or in the network traffic. It is easy to find(More)